<template>
  <!-- 底部部分 -->
    <footer class="footer">
      <span class="todo-count"><strong></strong>剩余{{list.length}}</span>
      <ul @click="$emit('changeType',type)" class="filters">
        <li>
          <a @click.prevent="type='all'" 
          :class="{selected :type === 'all'}" 
          href="#/">全部</a>
        </li>
        <li>
          <a  @click.prevent="type='active'" 
          :class="{selected :type === 'active'}"
          href="#/active">进行中</a>
        </li>
        <li>
          <a 
           @click.prevent="type='completed'" 
          :class="{selected :type === 'completed'}"
          href="#/completed">已完成</a>
        </li>
      </ul>
      <button  @click="clearDone" v-show="showClear" class="clear-completed">清除已完成</button>
    </footer>
</template>

<script>
export default {
  name: 'TodoFooter',
 //父传子将list数组传输过来
 props: {
    list: {
      type: Array,
      required: true
    }
  },
  data() {
    return {
      type:'all'
    };
  },
  computed:{
      showClear(){
    return this.list.some(item=>item.isDone)
  }
  },
  methods: {
    clearDone(){
      this.$emit('clearDone')
    }
    
  },
};
</script>

<style lang="scss" scoped>

</style>